import java.util.Scanner;

public class One {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n=in.nextInt();
        int a=0,b=1,c=1;
        while(n>c){
            a=b;
            b=c;
            c=a+b;
        }
        System.out.println(Math.min(c-n,n-b));
    }
}
